import cv2

img = cv2.imread('boom_img.png')
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
t, binary = cv2.threshold(gray, 127, 255, cv2.THRESH_BINARY)
contours, hierarchy = cv2.findContours(binary, cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE)
center, radius = cv2.minEnclosingCircle(contours[0])
x = int(round(center[0]))
y = int(round(center[1]))
cv2.circle(img, (x, y), int(radius), (0, 0, 255), 2)
cv2.imshow('img', img)
cv2.waitKey()
cv2.destroyAllWindows()
